Internal mixing system



FIG. 1 is an exploded perspective view of the internal mixing system showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a cross-sectional view thereof, in an assembled condition;

FIG. 4 is a cross-sectional view of the center piece, show separately for clarity of disclosure;

FIG. 5 is a front elevational view of FIG. 4, the rear being identical;

FIG. 6 is a side elevational view of FIG. 4, the opposite side being identical;

FIG. 7 is a top elevational view of FIG. 4; and,

FIG. 8 is a bottom plan view of FIG. 4. 

I claim the ornamental design for an internal mixing system, as shown and described. 